The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2025
Filed:
Dec. 21, 2018
Applicant:
Transitions Optical, Ltd., Tuam, IE;
Inventors:
Ryan Stayshich, Pittsburgh, PA (US);
Darrin R. Dabideen, Pittsburgh, PA (US);
Zachary Smith, Pittsburgh, PA (US);
Robert W. Walters, Murrysville, PA (US);
Assignee:
Transitions Optical, Ltd., Tuam, IE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 491/052 (2006.01); C09K 9/02 (2006.01);
U.S. Cl.
CPC ...
C07D 491/052 (2013.01); C09K 9/02 (2013.01);
Abstract
Provided is a photochromic indolenaphthopyran compound having the skeletal structure of Formula (I): wherein Rand Reach independently have a steric bulk A, wherein at least one of Ror Rhas a steric bulk A of at least 0.6, Rand Reach independently have a Hammett σp value, and wherein the indolenaphthopyran compound has a calculated electronic steric factor of at least −3.3.